Warning: preg_match(): Compilation failed: group name must start with a non-digit at offset 8 in /var/www/sdb/e/8/system.co/includes/MagicWord.php on line 722

Warning: preg_match(): Compilation failed: group name must start with a non-digit at offset 8 in /var/www/sdb/e/8/system.co/includes/MagicWord.php on line 722

Warning: preg_match_all(): Compilation failed: group name must start with a non-digit at offset 4 in /var/www/sdb/e/8/system.co/includes/MagicWord.php on line 700

Warning: Invalid argument supplied for foreach() in /var/www/sdb/e/8/system.co/includes/MagicWord.php on line 701

Warning: preg_replace(): Compilation failed: group name must start with a non-digit at offset 4 in /var/www/sdb/e/8/system.co/includes/MagicWord.php on line 705

Warning: preg_match_all(): Compilation failed: group name must start with a non-digit at offset 4 in /var/www/sdb/e/8/system.co/includes/MagicWord.php on line 700

Warning: Invalid argument supplied for foreach() in /var/www/sdb/e/8/system.co/includes/MagicWord.php on line 701

Warning: preg_replace(): Compilation failed: group name must start with a non-digit at offset 4 in /var/www/sdb/e/8/system.co/includes/MagicWord.php on line 705

Warning: preg_match_all(): Compilation failed: group name must start with a non-digit at offset 4 in /var/www/sdb/e/8/system.co/includes/MagicWord.php on line 700

Warning: Invalid argument supplied for foreach() in /var/www/sdb/e/8/system.co/includes/MagicWord.php on line 701

Warning: preg_replace(): Compilation failed: group name must start with a non-digit at offset 4 in /var/www/sdb/e/8/system.co/includes/MagicWord.php on line 705

Warning: preg_match_all(): Compilation failed: group name must start with a non-digit at offset 4 in /var/www/sdb/e/8/system.co/includes/MagicWord.php on line 700

Warning: Invalid argument supplied for foreach() in /var/www/sdb/e/8/system.co/includes/MagicWord.php on line 701

Warning: preg_replace(): Compilation failed: group name must start with a non-digit at offset 4 in /var/www/sdb/e/8/system.co/includes/MagicWord.php on line 705

Warning: preg_match(): Compilation failed: group name must start with a non-digit at offset 8 in /var/www/sdb/e/8/system.co/includes/MagicWord.php on line 722

Warning: preg_match(): Compilation failed: group name must start with a non-digit at offset 8 in /var/www/sdb/e/8/system.co/includes/MagicWord.php on line 722

Warning: preg_match(): Compilation failed: group name must start with a non-digit at offset 8 in /var/www/sdb/e/8/system.co/includes/MagicWord.php on line 722

Warning: preg_match(): Compilation failed: group name must start with a non-digit at offset 8 in /var/www/sdb/e/8/system.co/includes/MagicWord.php on line 722

Warning: preg_match_all(): Compilation failed: group name must start with a non-digit at offset 4 in /var/www/sdb/e/8/system.co/includes/MagicWord.php on line 700

Warning: Invalid argument supplied for foreach() in /var/www/sdb/e/8/system.co/includes/MagicWord.php on line 701

Warning: preg_replace(): Compilation failed: group name must start with a non-digit at offset 4 in /var/www/sdb/e/8/system.co/includes/MagicWord.php on line 705

Warning: preg_match_all(): Compilation failed: group name must start with a non-digit at offset 4 in /var/www/sdb/e/8/system.co/includes/MagicWord.php on line 700

Warning: Invalid argument supplied for foreach() in /var/www/sdb/e/8/system.co/includes/MagicWord.php on line 701

Warning: preg_replace(): Compilation failed: group name must start with a non-digit at offset 4 in /var/www/sdb/e/8/system.co/includes/MagicWord.php on line 705

Warning: preg_match(): Compilation failed: group name must start with a non-digit at offset 8 in /var/www/sdb/e/8/system.co/includes/MagicWord.php on line 722

Warning: preg_match(): Compilation failed: group name must start with a non-digit at offset 8 in /var/www/sdb/e/8/system.co/includes/MagicWord.php on line 722
Variables bash - system.co.free.fr

Variables bash

De system.co.free.fr.
(→Définir une variable uniquement si elle est indéfinie ou nul)
(→Définir une variable uniquement si elle est indéfinie ou nul)
 
Ligne 268 : Ligne 268 :
echo ${VAR?pas definie} # rien, valeur nulle autorisée
echo ${VAR?pas definie} # rien, valeur nulle autorisée
echo ${VAR:?valeur nulle} # -bash: VAR: pas definie (sur stderr)
echo ${VAR:?valeur nulle} # -bash: VAR: pas definie (sur stderr)
-
 
-
==Définir une variable uniquement si elle est indéfinie ou nul==
 
-
<pre>
 
-
VAR=${VAR:=valeur_par_defaut} # VAR prend la valeur
 
-
# valeur_par_defaut
 
-
</pre>
 

Version actuelle en date du 8 novembre 2020 à 08:15

Récupérée de « http://system.co.free.fr/index.php?title=Variables_bash »
Outils personnels